When stopping a task via RedisCluster using POST /api/tasks/stop/{task_id}, the operation fails . The previous implementation relied on a pub/sub mechanism that did not properly handle task cancellation, causing tasks to remain active and preventing a reliable stop.
I found that the task cancellation should propagate across nodes, but the pub/sub approach does not guarantee it. Switching to a state-based approach ensures the stop signal is recognized consistently in the cluster.
Verified the fix works with multi-node RedisCluster
No changes to API response or behavior except fixing the bug
Contributor License Agreement
By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.
🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.
## 📋 Pull Request Information
**Original PR:** https://github.com/open-webui/open-webui/pull/20803
**Author:** [@HANIHALILI](https://github.com/HANIHALILI)
**Created:** 1/19/2026
**Status:** 🔄 Open
**Base:** `dev` ← **Head:** `fix/19840-rediscluster-stop-task`
---
### 📝 Commits (10+)
- [`fe6783c`](https://github.com/open-webui/open-webui/commit/fe6783c16699911c7be17392596d579333fb110c) Merge pull request #19030 from open-webui/dev
- [`fc05e0a`](https://github.com/open-webui/open-webui/commit/fc05e0a6c5d39da60b603b4d520f800d6e36f748) Merge pull request #19405 from open-webui/dev
- [`e3faec6`](https://github.com/open-webui/open-webui/commit/e3faec62c58e3a83d89aa3df539feacefa125e0c) Merge pull request #19416 from open-webui/dev
- [`9899293`](https://github.com/open-webui/open-webui/commit/9899293f050ad50ae12024cbebee7e018acd851e) Merge pull request #19448 from open-webui/dev
- [`140605e`](https://github.com/open-webui/open-webui/commit/140605e660b8186a7d5c79fb3be6ffb147a2f498) Merge pull request #19462 from open-webui/dev
- [`6f1486f`](https://github.com/open-webui/open-webui/commit/6f1486ffd0cb288d0e21f41845361924e0d742b3) Merge pull request #19466 from open-webui/dev
- [`d95f533`](https://github.com/open-webui/open-webui/commit/d95f533214e3fe5beb5e41ec1f349940bc4c7043) Merge pull request #19729 from open-webui/dev
- [`a727153`](https://github.com/open-webui/open-webui/commit/a7271532f8a38da46785afcaa7e65f9a45e7d753) 0.6.43 (#20093)
- [`6adde20`](https://github.com/open-webui/open-webui/commit/6adde203cd292a9e3af9c64a2ae36b603fed096a) Merge pull request #20394 from open-webui/dev
- [`f9b0534`](https://github.com/open-webui/open-webui/commit/f9b0534e0c442631d1cb7205169588b9b6204179) Merge pull request #20522 from open-webui/dev
### 📊 Changes
**2 files changed** (+92 additions, -54 deletions)
<details>
<summary>View changed files</summary>
📝 `backend/open_webui/main.py` (+0 -9)
📝 `backend/open_webui/tasks.py` (+92 -45)
</details>
### 📄 Description
### Description
When stopping a task via RedisCluster using POST /api/tasks/stop/{task_id}, the operation fails . The previous implementation relied on a pub/sub mechanism that did not properly handle task cancellation, causing tasks to remain active and preventing a reliable stop.
I found that the task cancellation should propagate across nodes, but the pub/sub approach does not guarantee it. Switching to a state-based approach ensures the stop signal is recognized consistently in the cluster.
### Fixed #19840
Stop task now works correctly in RedisCluster
### Additional Information
Verified the fix works with multi-node RedisCluster
No changes to API response or behavior except fixing the bug
### Contributor License Agreement
By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.
---
<sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>
Blocking a user prevents them from interacting with repositories, such as opening or commenting on pull requests or issues. Learn more about blocking a user.
📋 Pull Request Information
Original PR: https://github.com/open-webui/open-webui/pull/20803
Author: @HANIHALILI
Created: 1/19/2026
Status: 🔄 Open
Base:
dev← Head:fix/19840-rediscluster-stop-task📝 Commits (10+)
fe6783cMerge pull request #19030 from open-webui/devfc05e0aMerge pull request #19405 from open-webui/deve3faec6Merge pull request #19416 from open-webui/dev9899293Merge pull request #19448 from open-webui/dev140605eMerge pull request #19462 from open-webui/dev6f1486fMerge pull request #19466 from open-webui/devd95f533Merge pull request #19729 from open-webui/deva7271530.6.43 (#20093)6adde20Merge pull request #20394 from open-webui/devf9b0534Merge pull request #20522 from open-webui/dev📊 Changes
2 files changed (+92 additions, -54 deletions)
View changed files
📝
backend/open_webui/main.py(+0 -9)📝
backend/open_webui/tasks.py(+92 -45)📄 Description
Description
When stopping a task via RedisCluster using POST /api/tasks/stop/{task_id}, the operation fails . The previous implementation relied on a pub/sub mechanism that did not properly handle task cancellation, causing tasks to remain active and preventing a reliable stop.
I found that the task cancellation should propagate across nodes, but the pub/sub approach does not guarantee it. Switching to a state-based approach ensures the stop signal is recognized consistently in the cluster.
Fixed #19840
Stop task now works correctly in RedisCluster
Additional Information
Verified the fix works with multi-node RedisCluster
No changes to API response or behavior except fixing the bug
Contributor License Agreement
By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.
🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.